It's possible. It happened frequently enough at IKEA that it became an internet meme/challenge and they had to start prosecuting people who did it.

The general store employees have a big "not my job" attitude about it. If it's time to clock out, it's your problem that you're still in the store after closing. Not likely to confront you about it unless you are wandering the aisles.

Cleaning staff will probably tell someone if they find you hiding out.

Security guards will be actively looking for you and also search in obvious places like tents and sheds that are set up indoors, as well as behind shelving units, in the backrooms, etc.